Sliding window lock



@ci. i7, 1%67 G. CHMURA SLIDING WINDOW LOCK Filed June 27, 1966 5 INVENTOR.

'j- 7 30 GENE CHMURA BY Z. /I

ATTORNEYS United States Patent 3,347,585 SLIDING WINDOW LOCK Gene Chmura, 8510 Phillips Ave., Chicago, 1]]. 60617 Filed June 27, 1966, Ser. No. 560,706 6 Claims. (Cl. 292-294) This invention relates to a lock particularly designed for sliding windows.

One object of the invention is to provide a lock of the character disclosed which is comparatively simple and nexpensive to manufacture, and which may be easily installed on sliding windows and the like whether of the horizontal sliding type or the vertical (double-hung) type.

Another object is toprovide a window lock which comprises an elongated element adapted to be located between two relatively slidable sashes, to be secured to an edge of one and to extend to a position beyond an edge of the other sash, to lock element being positioned at selected points along the elongated element so that the opening of one sash relative to the other can be limited to an adjustable degree.

Still another object is to provide the elongated element with opposite companion notches and a lock element of U-shaped character having a solid portion to enter one notch and a lock screw to pass through the legs of the lock element and enter the opposite companion notch.

A further object is to mount the lock element reversibly on the elongated element so that the elongated element can be mounted either left-hand or right-hand as desired.

Still a further object is to provide a lock element of U-shaped character to extend around one edge and two faces of the elongated element, a lock screw extending through the outer ends of the arms thereof to engage the opposite edge of the lock element.

An additional object is to provide the lock screw of the lock element removable (or partially so) so that the lock element may he slid along the elongated element for adjustment purposes or removed for installation of the elongated element on the window.

With these and other objects in view, my invention consists in the construction, arrangement and combination of the various parts of my sliding window lock, whereby the objects above contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in detail on the accompanying drawing wherein:

FIG. 1 is an exploded perspective view of my sliding window lock;

FIG. 2 is a plan view of a pair of sashes slidable horizontally relative to each other showing by sliding window lock installed;

FIG. 3 is a front view of FIG. 2;

FIG. 4 is an enlarged vertical sectional view on the line 44 of FIG. 3;

FIG. 5 is a sectional view on the line 5-5 of FIG. 4;

FIG. 6 is an elevation of a modified form of lock element; and

FIG. 7 is a plan view of a modified element.

On the accompanying drawing I have used the reference character EE to indicate in general an elongated element, and LE a lock element.

In FIGS. 2 and 3 a rail 10, a stile 12, and a glass pane form of elongated 14 of an inner sliding sash is shown, as well as a rail 20,

a stile 22 and a glass pane 24 of an outer sash. These sashes, of course, are mounted in guide grooves of a window frame (not shown), and since the stile 12 is to the right of the stile 22, one or the other of the sashes is open inasmuch as the sashes are closed when these two stiles are in alignment with each other.

The elongated element EE has a flange 19 and along its upper edge a series of spaced notches 16. Along its lower edge is aseries of companion notches 18. The elongated element and its flange 19 are provided with perforations 17 and 15 respectively for mounting the elongated element on one of the sashes such as by securing it by screws 17a and 15a to the stile 22 as shown in FIG. 3. Either set of perforations 15 or 17 may be used instead of both as dictated by the type of window sash on which my lock is installed.

The elongated element EE extends between the sashes and the lock element LE is locked thereto, for instance as shown in FIGS. 2 and 3, so as to limit the opening of the sashes as indicated by dotted lines in FIG. 2. In FIG. 3 the sashes have not been opened the full limit. Since a series of notches 16 and 18 are provided it is obvious that the lock element LE maybe adjusted to different positions along the elongated element for different degrees of opening of the sashes relative to each other.

As to the specific construction of the lock element LE, it is U-shaped as illustrated having arms 28 and 30 and a solid portion 26 adapted to enter one of the notches 16 or 18 and substantially fill the notch to align the lock element on the elongated element. The arms 28 and 30 and the solid portion 26 thus enclose the two faces and one edge of the elongated element EE, and a lock screw 32 is provided for entering the companion notch 18 or 16 as the case may be and enclose the remaining edge of the elongated element. The lock screw may be removed or backed out sufliciently to avoid projecting into the path of the elongated element when it is desirable to change the location of the lock element on the elongated element, whereupon the lock element may be shifted to another pair of notches 16, 18 and locked in position.

Preferably, the head of the lock screw shown at 34 is countersunk in the arm 28 and requires a special wrench (such as an Allen type) where children might unlock the lock element and open the window far enough to fall out. Where there is no such problem a modified type of lock screw 32a may be provided as shown in FIG. 6 having a narrow head 34a that requires no tools for its manipulation.

In some cases it might be unnecessary or undesirable to use screws such as 15a or 17a to fasten the elongated element in position on the sash. A modification is shown in FIG. 7 having an additional flange 36 which extends back over the stile of the sash and may frictionally engage it without the necessity of screw anchorage. Once installed and the lock element applied to the elongated element, the lock structure will remain properly in position without using screws to anchor it to one of the sashes.

In order to avoid damage to edges of sash stiles, the leg 28 of the lock element EE may be provided with resilient facings 38 of rubber or the like.

From the foregoing specification it will be obvious that I have provided a comparatively simple and inexpensive sliding window lock that can be readily installed and is easy to operate. It is particularly desirable to eliminate the possibility of children opening windows far enough that they can fall out of them, and therefore particularly suitable for high-rise apartment buildings and the like. My lock also prevents easy unauthorized entry into a dwelling through an open window as it limits the opening thereof yet does permit a certain degree of opening for ventilation purposes and the like.

The elongated element EE may be formed economically by stamping it from sheet metal and the lock element LE is a comparatively simple part which may be die cast or formed of bar stock with a simple slotting operation and a drilling and tapping operation.

Some changes may be made in the construction and arrangement of the parts of my sliding window lock without departing from the real spirit and purpose of my invention, and it is my intention to cover by my claims anv modified forms of structure or use of mechanical equivalents which may reasonably be included within their scope.

I claim as my invention:

1. A sliding window lock comprising in combination with inner ad outer window sashes, an elongated element adapted to be located between said sashes, and to be secured to the edge of one, said elongated element extending from the point of securement to a position beyond an edge of the other sash, and a U-shaped lock element adapted to be locked to said elongated element to limit relative sliding movement of said sashes to open position by engagement of said edge of said other sash therewith, said elongated element having notches spaced along opposite edges thereof, and said lock element having a solid portion to enter any notch along one edge thereof and a removable portion adapted to enter the companion notch in the opposite edge thereof.

2. A sliding window lock in accordance with claim 1 wherein said solid portion of said lock element is adapted to substantially fit said notch to prevent undesirable rotation of said lock element on said elongated element.

3. A sliding window lock in accordance withclaim 1 wherein said removable portioncomprises a lock screw through the two legs of said U-shaped lock element.

4. A sliding window lock in accordance with claim 2 wherein said removable portion comprises a lock screw through the two legs of said U-shaped lock element.

5. A sliding window lock in accordance with claim 3 wherein said lock screw is countersunk in said lock element.

6. A sliding window lock in accordance with claim 1 wherein said lock element has a resilient facing on the side thereof against which said edge of said other sash may engage at the limit of sliding movement of said sashes to open position.

References Cited UNITED STATES PATENTS 518,253 4/1894 Kimball 292156 866,548 9/1907 Wilkinson 292292 904,347 11/1908 Mis 292-156 3,014,747 12/1961 Nichols 292294 MARVIN A. CHAMPION, Primary Examiner.

E. J. MCCARTHY, Assistant Examiner. 

1. A SLIDING WINDOW LOCK COMPRISING IN COMBINATION WITH INNER AND OUTER WINDOW SASHES, AN ELONGATED ELEMENT ADAPTED TO BE LOCATED BETWEEN SAID SASHES, AND TO BE SECURED TO THE EDGE OF ONE, SAID ELONGATED ELEMENT EXTENDING FROM THE POINT OF SECUREMENT TO A POSITION BEYOND AN EDGE OF THE OTHER SASH, AND A U-SHAPED LOCK ELEMENT ADAPTED TO BE LOCKED TO SAID ELONGATED ELEMENT TO LIMIT RELATIVE SLIDING MOVEMENT OF SAID SASHES TO OPEN POSITION BY ENGAGEMENT OF SAID EDGE OF SAID OTHER SASH THEREWITH, SAID ELONGATED ELEMENT HAVING NOTCHES SPACED ALONG OPPOSITGE EDGES THEREOF, AND SAID LOCK ELEMENT HAVING A SOLID PORTION TO ENTER ANY NOTCH ALONG ONE EDGE THEREOF AND A REMOVABLE PORTION ADAPTED TO ENTER THE COMPANION NOTCH IN THE OPPOSITE EDGE THEREOF. 